You are required to zone your raid into a special instance of the Shattered Vale, where you will have to defeat several Epic Gnolls, including High Shaman Vascha.

Strategy

What will be needed for this Raid, and what should we be doing?:

1 - Main Tank: Obviously you will need to keep aggro with the Main Boss. Do not worry about anything else

1 - Off Tank: Keep Agro with ALL adds in the zone.

1 - Off Tank Healer: Healing the Off Tank, So he/she can keep agro with the adds.

1 - Off Tank DPS: Assisting the Off Tank in Killing the adds.

8 - Everyone else: Assisting or healing the Main Tank

Notes: This Raid is won by controlling the adds and striking down the main boos as quick as possible.
A Lot of adds spawn once you are on the main boss, so you'll need a decent equipped MT for this task.
I did this with ease on Rayn (70 Paladin) mentored to 33 and having only Xegonite armor.

Walk Through:

Upon entering the zone and once you are situated, there will be 2 groups of mobs right away, in the pathway leading out. Kill these in what ever fashion you like. MT and OF take one mob each. Practice Assisting for the later adds.

Head to the end of the cavern, but do not go out. Stay back in just a little bit to avoid the roamers.

MT - Walks out and pulls roamers (one at a time or however you feel comfortable) back into the cavern to the raid force.

Do this until all roamers are defeated.

MT - can now walk out to the end of the dirt path (outside the cavern) and pull the group of mob from the mage circle to him. The fight will happen at the end of the dirt path outside the cavern.

Defeating the group of mobs will then spawn 1 big mob, now the ADDs start coming in - OT get ready for your job, as you are now up for some action.

Once the main boss is defeated, the remaining Raid force can then help with the adds. (kill the main boss first)

It seems that our city spies have uncovered a plot between a small religious group and the Sabertooth Clan to assassinate someone high within our city. From what I have been told, these religious zealots have summoned fierce avatars and shackled them to the will of a gnoll high shaman, hidden deep in Antonica within the Shattered Vale. It has been decreed by the city to assemble a dozen of our guilds fiercest in its defense, should we choose to take up this task.

Stage 1

We need to protect the city by locating the gnoll shaman within the Shattered Vale.

Start:

We need to locate and defeat High Shaman Vascha.

Complete:

We located and defeated High Shaman Vascha!

We put a stop to the High Shaman and the meeting with some unknown religious group.

We managed to foil the plot that was in motion by this mysterious religious sect and the Sabertooth Clan. The High Shaman Vascha has been defeated and driven back for the time being.